My oldest is in third grade and my youngest in first, so I thought I'd make a list of some great websites for children. Some of these are personal favorites and others are recommended by my children's teachers past and present. Happy fun!
***This site is a personal favorite of mine. Teachers or parents can input spelling (and now vocabulary too!) lists. There are even pre-made lists including: Sight words, Colors, Homophones, Compound words, SAT words, etc. Children have the option of spelling test, vocab test, teach me or play games. In the Teach Me spelling portion they will say the word, spell it and use it in a sentence. Games/activities include: Hangmouse, Word Search and Unscramble. My son has tested higher on his spelling tests after using this website. It makes learning more interactive and fun for him. I highly recommend it!
Berenstain Bears http://www.berenstainbears.com/
Between the Lions http://pbskids.org/lions/stories/
Book Pals http://www.storylineonline.net/
Book Adventure Book Adventure is a reading motivation program for children in grades K-8. Children create their own book lists from over 6,000 recommended titles, take multiple choice quizzes on the books they've read offline, and earn points and prizes for their literary successes. K-8
Children's Storybooks Online http://www.magickeys.com/books/
Factfinder Kids' Corner http://factfinder.census.gov/home/en/kids/kids.html
Interactive Math Activities http://www.globalclassroom.org/authors/florida/math/interactive.html
Cool Science for Curious Kids http://www.hhmi.org/coolscience/
Harcourt Math Glossary http://www.harcourtschool.com/glossary/math2/index_temp.html
Math Playground http://www.mathplayground.com/ ***Another favorite of my kids
Fun Brain http://www.funbrain.com ***Another favorite
Star Fall http://www.starfall.com ***Great site
Discovery Channel http://kids.discovery.com/
National Geographic for Kids http://kids.nationalgeographic.com/
Primary Games http://www.primarygames.com
First Grade Skill Builders This site gives you different interactive sites for all subjects and is targeted for first grade. http://www.internet4classrooms.com/skills_1st.htm
Timed Multiplication, Division, Subtraction, Addition http://www.mhschool.com/math/2003/student/factdash/popup.html
Addition, Subtraction and Multiplication Flashcards http://www.aplusmath.com
Area and Perimeter http://www.mathplayground.com/geometryMovie.html
Math and Reading Help http://math-and-reading-help-for-kids.org/index.html
Friendly Letter Generator http://readwritethink.org/materials/letter_generator/
These are just a few great sites that are both educational and fun for elementary school children. Children learn better when it's fun. It's as easy as that! I hope you and your child(ren) will enjoy these and pass them on to other parents/teachers. If you have any recommendations please let me know and I'll add them!